Jennifer Aniston has stated that she’s a “forgiving person” in a new interview, while the loved-up star also gushes over her fiancé Justin Theroux.

The former Friends star admits that she’s had the best time of her life in the last five years, since reaching her 40s, and insists that holding on to negativity and grudges “builds up like toxic waste”.

Jen, 45, stars on the new cover for the December/January issue of Harper’s Bazaar, and in the interview she opens up about the new zone in her life.

“I’ve had more fun post-40 than I can remember, from a work point of view, a physical point of view, a psychotherapeutic point of view,” she told the magazine, revealing that she took a break from dating to focus on herself.

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"It really helped me get to a place where I was more comfortable with myself, truly ready for love and for a partner. The past wasn't 'less than.' It was extremely important to my growth as a woman."

Jen, whose five-year marriage to Brad Pitt ended in 2005, went on to date a number of Hollywood stars including Vince Vaughn and John Mayer before finding love again with hubby-to-be Justin Theroux in 2011.

The couple got engaged in August 2012, after being “just buddies” for a while but fell for each other while shooting their comedy Wanderlust together.

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"If you take the law of attraction, if you only love yourself 70 percent, that's what's going to come back to you,” Jen explained.

"So you fill up that 30 percent, then all of a sudden there's this pure, good love standing right in front of you. Then you realize, 'Oh, this can be easy! It doesn't have to be so hard.'"

But, Jen holds no grudges, as she said: "[I'm] a forgiving person. I absolutely am. I think it's extremely important to forgive. Otherwise it just builds up like toxic waste. There's nothing worse than holding a grudge.

“Listen, people can do unforgivable things, but you have to let it go and say, 'Look, we're all human beings. We make mistakes.' To hold any kind of resentment is like taking rat poison and waiting for the rat to die."

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The Emmy winner, who lives with the 43-year-old in their home in Los Angeles, claims that he’s her “creative crush”.

"Justin Theroux," she said. "Not only is he a great actor but he's one of the best comedy writers out there. And he directs and paints murals. I just think it's so attractive to be that good at so many things and to have no ego. He's one of the most humble, decent human beings. He's not an ass. He's not like some of our friends who are young and up-and-coming and they hit celebrity, and all of a sudden you're like, 'Oh! You're different. Now you don't say hi to people?'"

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But it’s not just Justin’s creative talents that get Jen excited, as she also respects the way that he’s handled the constant attention that the couple have dealt with since they got together.

"He's just been doing it so graciously and gracefully, and it's a strange ballpark to walk into. He's in his body, for sure. He's a pretty realised person,” she said.

"It's almost impossible to get bored with one another/ We've tried so hard! And even that's interesting because his eyes are so pretty, but we can entertain ourselves and talk about endless things, which is pretty great."